How to NOT get banned from PSN?

Hello Guys!

I am going to buy a CFW PS3 later on and was wondering what is the safest possible way to not get banned? There was a recent ban wave and many CFW PS3's were banned! How many of you's were banned? Also how can I be safe so I don't get banned? I already got a OFW PS3 so I won't be playing online with my CFW. But, I want to stay offline play a lot of single player backup games and then when I gather a huge amount of trophies, I would like to sync them. Would I get banned for doing that?

Thanks!